This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -1 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 3 |
| 8 | 1 |
| 9 | -1 |
| 10 | -4 |
| 11 | -10 |
| 12 | 3 |
| 13 | 0 |
| 14 | 9 |
| 15 | 19 |
| 16 | 9 |
| 17 | 2 |
| 18 | -44 |
| 19 | -27 |
| 20 | -40 |
| 21 | -3 |
| 22 | 95 |
| 23 | 75 |
| 24 | 156 |
| 25 | -36 |
| 26 | -181 |
| 27 | -274 |
| 28 | -349 |
| 29 | 81 |
| 30 | 205 |
| 31 | 982 |
| 32 | 832 |
| 33 | 35 |
| 34 | -596 |
| 35 | -2587 |
| 36 | -1803 |
| 37 | -1259 |
| 38 | 2118 |
| 39 | 5876 |
| 40 | 5365 |
| 41 | 4922 |
| 42 | -6811 |
| 43 | -12175 |
| 44 | -17181 |
| 45 | -12932 |
| 46 | 14144 |
| 47 | 28575 |
| 48 | 53548 |
| 49 | 27663 |
| 50 | -19181 |